circuitpython/ports/stm32/boards/LEGO_HUB_NO6/cc2564.c

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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2021 Damien P. George
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <stdio.h>
#include "py/runtime.h"
#include "py/mphal.h"
#include "timer.h"
#include "extmod/mpbthci.h"
#if !BUILDING_MBOOT
#define CC2564_PIN_CTS (pyb_pin_BT_CTS)
#define CC2564_PIN_RTS (pyb_pin_BT_RTS)
#define CC2564_PIN_BT_SLOWCLK (pyb_pin_BT_SLOWCLK)
#define CC2564_PIN_BT_ENABLE (pyb_pin_BT_ENABLE)
// slight difference between LEGO_HUB_NO6 and LEGO_HUB_NO7
#ifndef CC2564_TIMER_BT_SLOWCLOCK_TIM
#define CC2564_TIMER_BT_SLOWCLOCK_TIM 8
#define CC2564_TIMER_BT_SLOWCLOCK_TIM_CH 4
#endif
STATIC void cc2564_wait_cts_low(mp_hal_pin_obj_t cts, uint32_t timeout_ms) {
for (int i = 0; i < timeout_ms; ++i) {
if (mp_hal_pin_read(cts) == 0) {
break;
}
mp_hal_delay_ms(1);
}
}
int mp_bluetooth_hci_controller_init(void) {
// Pull BTNSHUTD low to disable chip.
mp_hal_pin_output(CC2564_PIN_BT_ENABLE);
mp_hal_pin_low(CC2564_PIN_BT_ENABLE);
// Output a 32768Hz signal on BTSLOWCLK.
// tim = pyb.Timer(TIM, freq=32768)
// tim_ch = tim.channel(TIM_CH, pyb.Timer.PWM, pin=btclk)
// tim_ch.pulse_width_percent(50)
mp_obj_t args[6] = { MP_OBJ_NEW_SMALL_INT(CC2564_TIMER_BT_SLOWCLOCK_TIM), MP_OBJ_NEW_QSTR(MP_QSTR_freq), MP_OBJ_NEW_SMALL_INT(32768), MP_OBJ_NULL };
mp_obj_t tim = MP_OBJ_TYPE_GET_SLOT(&pyb_timer_type, make_new)(&pyb_timer_type, 1, 1, args);
mp_load_method(tim, MP_QSTR_channel, args);
args[2] = MP_OBJ_NEW_SMALL_INT(CC2564_TIMER_BT_SLOWCLOCK_TIM_CH);
args[3] = MP_OBJ_NEW_SMALL_INT(0); // CHANNEL_MODE_PWM_NORMAL
args[4] = MP_OBJ_NEW_QSTR(MP_QSTR_pin);
args[5] = (mp_obj_t)CC2564_PIN_BT_SLOWCLK;
mp_obj_t tim_ch = mp_call_method_n_kw(2, 1, args);
mp_load_method(tim_ch, MP_QSTR_pulse_width_percent, args);
args[2] = MP_OBJ_NEW_SMALL_INT(50);
mp_call_method_n_kw(1, 0, args);
// Pull BTNSHUTD high to enable chip and wait for CTS to go low to indicate ready.
mp_hal_pin_high(CC2564_PIN_BT_ENABLE);
cc2564_wait_cts_low(CC2564_PIN_CTS, 500);
return 0;
}
int mp_bluetooth_hci_controller_deinit(void) {
// Pull BTNSHUTD low to disable chip.
mp_hal_pin_low(CC2564_PIN_BT_ENABLE);
return 0;
}
#endif